Thaddius is a rare variant of Thaddeus that peaked in 1989 and has since faded.
Thaddius is a boy name. It last appears in U.S. records in 2023. Thaddius first appears in 1916 and peaked in 1989 (18 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2023 | 5 | 5 | #13,975 |
| 2021 | 6 | 6 | #11,983 |
| 2020 | 7 | 7 | #10,489 |
| 2017 | 7 | 7 | #10,658 |
| 2016 | 5 | 5 | #13,986 |
| 2014 | 8 | 8 | #9,537 |
| 2013 | 10 | 10 | #8,043 |
| 2012 | 10 | 10 | #8,073 |
| 2011 | 8 | 8 | #9,510 |
| 2010 | 10 | 10 | #8,069 |
| 2009 | 8 | 8 | #9,767 |
| 2008 | 10 | 10 | #8,242 |
| 2007 | 8 | 8 | #9,682 |
| 2006 | 11 | 11 | #7,369 |
| 2005 | 7 | 7 | #10,041 |
| 2004 | 11 | 11 | #6,928 |
| 2003 | 6 | 6 | #10,746 |
| 2002 | 12 | 12 | #6,043 |
| 2001 | 12 | 12 | #5,975 |
| 2000 | 7 | 7 | #9,028 |
| 1999 | 10 | 10 | #6,475 |
| 1998 | 7 | 7 | #8,372 |
| 1997 | 9 | — | #6,564 |
| 1996 | 6 | — | #8,899 |
| 1995 | 10 | — | #5,878 |
| 1994 | 14 | — | #4,510 |
| 1993 | 12 | — | #4,961 |
| 1992 | 8 | — | #6,636 |
| 1991 | 14 | — | #4,202 |
| 1990 | 15 | — | #3,950 |
| 1989 | 18 | — | #3,317 |
| 1988 | 7 | — | #6,357 |
| 1987 | 11 | — | #4,210 |
| 1986 | 17 | — | #2,997 |
| 1985 | 15 | — | #3,206 |
| 1984 | 12 | — | #3,669 |
| 1983 | 10 | — | #4,116 |
| 1982 | 12 | — | #3,662 |
| 1981 | 7 | — | #5,430 |
| 1980 | 7 | — | #5,468 |
| 1979 | 9 | — | #4,373 |
| 1978 | 11 | — | #3,589 |
| 1977 | 7 | — | #5,073 |
| 1976 | 9 | — | #3,984 |
| 1975 | 8 | — | #4,276 |
| 1974 | 6 | — | #5,177 |
| 1973 | 17 | — | #2,394 |
| 1972 | 17 | — | #2,316 |
| 1971 | 13 | — | #2,801 |
| 1970 | 15 | — | #2,501 |
| 1969 | 8 | — | #3,567 |
| 1968 | 8 | — | #3,343 |
| 1967 | 7 | — | #3,522 |
| 1966 | 6 | — | #3,911 |
| 1964 | 6 | — | #3,993 |
| 1956 | 9 | — | #2,947 |
| 1955 | 8 | — | #3,180 |
| 1954 | 6 | — | #3,786 |
| 1946 | 5 | — | #3,970 |
| 1944 | 7 | — | #3,082 |
| 1938 | 5 | — | #3,986 |
| 1922 | 5 | — | #4,887 |
| 1917 | 7 | — | #3,515 |
| 1916 | 5 | — | #4,460 |